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    Sam his homework in his room now. A. does B. doing C. is doing D. do 【查看更多】

     

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    Sam              his homework in his room now.
    [     ]
    A. does                
    B. doing                
    C. is doing            
    D. do

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    Sam ______ his homework in his room now.
    [     ]
    A. does            
    B. doing          
    C. is doing        
    D. do

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